implement a 4x16 Decoder

 

Module

module decoder(d,w,x,y,z,);
input w,x,y,z;
output [15:0]d;//vector haiving 16 number of bits
assign d[0]= (~x) & (~y) &(~z) & (~w) ;//make 16 combinations of input
assign d[1]= (~x) & (~y) &(~z) & (w) ;
assign d[2]= (~x) & (~y) &(z) & (~w) ;
assign d[3]= (~x) & (~y) &(z) & (w) ;
assign d[4]= (~x) & (y) &(~z) & (~w) ;
assign d[5]= (~x) & (y) &(~z) & (w) ;
assign d[6]= (~x) & (y) &(z) & (~w) ;
assign d[7]= (~x) & (y) &(z) & (w) ;
assign d[8]= (x) & (~y) &(~z) & (~w) ;
assign d[9]= (x) & (~y) &(~z) & (w) ;
assign d[10]= (x) & (~y) &(z) & (~w) ;
assign d[11]= (x) & (~y) &(z) & (w) ;
assign d[12]= (x) & (y) &(~z) & (~w) ;
assign d[13]= (x) & (y) &(~z) & (w) ;
assign d[14]= (x) & (y) &(z) & (~w) ;
assign d[15]= (x) & (y) &(z) & (w) ;
endmodule

 

Stimulus

 

module decoder2;
wire d;
reg w,x,y,z;
decoder d1(d,w,x,y,z); //instantion of main module
initial
begin
x=0; y=0; z=0; w=0; //apply all combination of input
#10 x=0; y=0; z=0; w=1;
#10 x=0; y=0; z=1; w=0;
#10 x=0; y=0; z=1; w=1;
#10 x=0; y=1; z=0; w=0;
#10 x=0; y=1; z=0; w=1;
#10 x=0; y=1; z=1; w=0;
#10 x=0; y=1; z=1; w=1;
#10 x=1; y=0; z=0; w=0;
#10 x=1; y=0; z=0; w=1;
#10 x=1; y=0; z=1; w=0;
#10 x=1; y=0; z=1; w=1;
#10 x=1; y=1; z=0; w=0;
#10 x=1; y=1; z=0; w=1;
#10 x=1; y=1; z=1; w=0;
#10 x=1; y=1; z=1; w=1;
#10 $stop;
#10 $finish;
end
endmodule

 

Output